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  1. #include<stdio.h>
  2. const double PI=3.141592;
  3.  
  4. double circum_length(double r)
  5. { return 2.0*r*PI; }
  6.  
  7. double area(double r)
  8. { return PI*r*r; }
  9.  
  10. int main(void){ 
  11.  double r;
  12.  scanf("%lf",&r);
  13.  printf("円周の長さ：%lf m\n",circum_length(r));
  14.  printf("面積: %lf m2\n",area(r));
  15.  return 0; }
Success #stdin #stdout 0s 5276KB
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円周の長さ：25.132736 m
面積: 50.265472 m2
https://ideone.com/Ar61aW
language:
C (gcc 8.3)
created:
128 days ago
visibility:
public

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